Brake-shoe.



G. D. PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912 Patented June 24, 1913.

2 SHEET8SHBET L.

WHWR.

c. 1). PETTIS.

BRAKE SHOE.

APPLICATION FILED AUG. 3, 1912.

Patented June 24, 1913.

2 SHEETS-SHEET Z.

W W. m9

UNITED STATES PATENT OFFICE.

(mirror: 1); Firms, or CHICAGO, ILLINOIS.

- BRAKE-SHOE.

- Specifloation of Letters Patent.

Patented June 24, 1913.

-- Application filed August 3, 1912. Serial No. 713,175.

To all whom it may concern:

Be it known thatI, CLIFTON D. PE'1'1IS, a citizen of the United States,and a resident of the city of Chimp-o, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inBrake-Shoes,v of which I do declare the following to be a full, clear,and exact description, reference being had to the accompanying drawings,f rming part of this specification.

The present invention has relation more particularly to that class ofbrake shoes for railway cars in which provision is made forstrengthening the back portion of the shoe so that as the body of theshoe is worn away in service, the fracture of the shoe may be avoided.

The object of this invention is to provide a nexceedinglystrong andeflicientconstruction of shoe, and this object/is "accomplishedby thefeatures of novelty hereinafter de-- scribed, illustrated in thearxzompanyin'g drawings and particularly pointed outin" the claims atthe end of this specification- Figure 1 is an inner face view of theback or shell that incloses the back portion'of my improved shoe. Fig.2- is an inner face view of a reinforcing back plate adapted to setwithin the back or shell. Fig; 3 is an inner face view of the back orshell with the back plate locked thereto by means of eenterand end lugsof the shoe. Fig. 4 is a view in front elevation and Fig. 5 is a sideelevation of the completed shoe. view (upon an enlarged scale) of one ofthe end lugs before it is attached in position for use. Fig. 7 is adetail view of the center lug before it is attached to the shoe. Fig. 8is a view in side elevation of the center lug shown in Fig. 7. Fig. 9 isa view in vertical 1 section on line 9 9 of Fig. 4. Fig. 10 is a view incross section on line 1010 otx Fig. 4 Fig. 11v is a viewin cross sectionon line "dil -11 of Fig. 3. the cast metal body portion of the shoebeing "indicated by dotted lines. The body portion A of my improvedbrake shoe is preferably for-med of cast Fig. 6 is a. detail the back orshell B are formed openings to receive the end lugs of the shoe. In theac companying drawings I have shown an improved construction of centerlu such as is set forth and claimed in application Serial No. 711,304,filed by me in the United States a Patent ()liice J uly 24, 1912, andhave shown 12,1 2 -and"13, 13, and when my improved end lug is employed,the. end portions of the back or shell B will be provided with slots orholes 14, 15, 16 and 17. The'back or shell B will also, by preference,be formed with holes 18 and the back "plate or member C with holes 19,through which will be'poured the cast metal of which shoe will beformed. V

In the preferred form of my invention, my improved shoe is not onlyprovided-with a back or shell B at its back-and united thereto in thecasting operation, but is also provided with a supplemental reinforcingmember or members and, preferably,'in the shape of the back plate C ofductile metal. The preferred construction of this back plate or relnforcing member is shown more particularly in Figs. 2 and3 of thedrawings. The plate 6 is provided with holes-or openings 20, 20 and 21,21 to receive the locking members of the center lug, as will presentlyappear, these holes or openings corresponding with the'holes or openings12, 12 and 18,13- about the center of the'back or shell B. Similarly,the plate 0 is provided adjacent each of its ends with holes or openings22, 23, 24 and 25 adapted to receive the locking members of the endlugs, these holes or openings corresponding with the holes or openings14, 15, 16 and 17 adjacent the ends of the back or shell B. I

lt will be readily understood that various forms of center lugs or endlugs may be employed in my improved brake shoe, but I prefer to employend and center lugs of such character that they will serve to securelylock the back plate or reinforcing member the -of the -opening 25 of theback plate.

to the back or shell and, for this reason, my improved center and endlugs are shown.

The center lug, which may be formed of malleable metal or of platemetal, is shown as comprising a crown 30 (see Figs. 7 and 18) havingside walls 3] reinforced by latings 3 the purpose of which willpresently more fully appear.

My improved construction of end lug is shown as comprising a transversewall 40 adapted to extend across the end of the brake shoe, from whichwall depend short locking members 41 and 42 and a longer locking member43 having an opening 44 formed .therein.- ,At right angles to thetranversewall 40extends an inwardly projecting part, 46"from which risethe walls 47, and integral with the part 46 is formed a locking member48.

In forming my improved brake shoe, the reinforcing back plate or memberC will first be placed within the back Or shell B in such position thatthe center and end openings of the back plate shall coincide with thecorresponding central and end openings of the back or shell. The lockingmembers 35 of the center lug will then be passed through the openings13, 13 of the back or shell B and through the openings 21, 21 of theback plate. C, while the locking mmbers 36 of the center lug will bepassed through the openings 12, 12 of the back or shell B and throughthe openings 20, 20 of the back plate. After the locking members of thecenter lug have thus been passed through the openings of the backorshell and of the back plate, the locking members 35 on the lug will beturned outwardly and the locking members 36 will be passed through theholes 37 in the locking members 35, after which the free ends of thelocking members 36 will be bent laterally, so that the parts will assumethe position shown in Figs. 3 and 10 of the drawings. In like manner thelocking member 43 of each of the end lugs will be passed through acorresponding opening 15 in the back or shell B and a coincident opening23 in the back plate C, while the locking members 41 and 42 will bepassed through the openings 14 and 16 of the back or shell B and throughthe coincident openings 22 and 24 of the back plate C; and the lockingmember 48 will be passed through the opening 17 of the back or shell andthrough the coincident After the locking members have thus been passedthrough the openings of the back or shell toward the center of the shoeand the locking member 48 will be passed through the opening 44 of thelocking member 43,

and the end of the locking member 48 will be bent toward the center ofthe shoe. The

'locking members 4-1 and 42 will be bent toward the center of the shoe,as shown in Fig. 3. center lugs and of the end lugsbave thus been bent,not only will the lugs be securely connected to the back portion of theshoe, but the locking members of the lugs will serve to inosteffectively lock the back plate to the shell or back B. After the backplate and center and end lugs have been attached to the back or shell B,as shown in Fig; 3 of the drawings, the body A will be cast on to theseparts, as indicated more particularly in Figs. 5, 9 and 10 of thedrawings. Preferably, the pouring of the cast metal, of which the bodyof the brake shoe'will he formed, will be effected through the pouring\Vhen the locking members of the holes 18 of the back or shell B andholes 19 of the back plate C, and the cast metal not'only firmly unitewith the back or shell B in the casting operation, but will firmly unitealso with the back plate 0 and with the locking members of the. centerand endlugs, thus guarding against anygpossibility of the withdrawal ofthe lugsfor' separation of the parts. i

I prefer to reinforce my improved brake shoe with a pan shaped backportion B, the sides and end walls of which are cgmparatively shallow,for the reason that until the body A of the brake shoe is verymaterially reduced in thickness, it has strength to guard againstfracture. And it is when the body A of the shoe approaches the end ofits wearing capacity that the reinforcement of the back is required. Afurther reason for using a shallow back or shell B 'and for forming thisback or shell of thin'metal is, that the construction is far lessexpensive than if the walls of the back or shell were arried to the faceof the body of the shoe. nd eed, the thin metal of the back or shell B$0 coalesces with the body A of the shoe in the casting operation as toform in effect a tough skin or cover for the back portion of the shoethemetal of the back or shell B being thick enough, however, to stand upandmaintain its shape under the heat of the cast metal when the latter ispoured into the mold.

By having the integral side and end walls b and b of the shell B of suchdimensions that the edges of these walls terminate at a distance fromthe initial wearing face of the shoe, the side edges of the latteradjacent as shown in Fig. 10, and as required to properly engage thetreaden flange of the car wheel. Moreover, by employing a shal- -lowshell which is of course curved to correspond with the form of the shoe,the shell may be more readily and cheaply manufactured. It is understoodthat the side and end walls I) and 7) are not only integral with theback of the shell, but are integral with one another to securely supportthe body of the shoe when worn thin.

The reinforcing back plate abuts against the inner face of the back wallof the shell B and, while itextends approximately from side to side andfrom end to end thereof, it is smaller in area than the back wall of theshell to permit the metal of the body A to unite with the back wall inthe casting operation. Preferably, also, the reinforcing member C isprovided with lips c at intervals throughout its lengt-h'which are bentinwardly away from the inner face of the back of the-shell. These lipsthus increase the area over which the cast metal body is united to theback of the shell and are also embedded in the cast metal body to moreefl'ectively unite the parts.

Various other forms of back plates or reinforcing members may be usedwithout departure rom the spirit of the invention, and the details ofconstruction above set out may also be varied within .wide' limitswithout departing from the scope of the invention. Thus, for example,the feature of employing a reinforcing back plate or member within aninclosing shell may be used to ad vantage even with a body portionformed of any of the compositions of material commonly employed in themanufacture of brake shoes, but in such case, of course, it will benecessary to give greater depth to the body of the hacker shell. So,also, features ofthe invention may be employed without its adoption asan entirety.

Having thus described my invention, what 'I claim as new, and desire tosecure by Letters Patent, is

1. A brake shoe comprising a cast metal body provided with a shallowreinforcing back or shell formed of thin ductile metal and havingintegral side and end walls surrounding the body of the shoe andterminatingabove the initial wearing face of the shoe, said shell beingunited directly to the metal body of the shoe in the casting operation.

9. A brake shoe comprising a cast metal body, a pan shaped ductile metalback and a supplemental reinforcing back plate located within said panshaped back, said I supplemental reinforcing plate being of smaller areathan the back wall of said ductile metal back to permit the cast metalof the body to unite with said back wall int-he casting operation.

3. A brake shoe comprising a cast metal .body having curved edges at thesides of its member located withinsaid back and extending approximatelyfrom side to side and from end to end thereof and center and end lugshaving parts passing through said back and bent about said reinforcingmember.

5. A brake shoe comprising abody having a ductile metal back and havinga supplemental reinforcing back member located within said back, and endlugs having parts passing through said back and through said reinforcingmember, the ends of said parts being bent to interlock said back andsaid reinforcing member together.

6. Abrake shoe comprisin a cast metal body having a perforated bac ofthin ductile metal bent to form ashallow pan or shell, a supplementalreinforcing member of thicker ductile metal and lugs connecting saidback and supplemental member, the ends of, said lugs being bent andembedded in the cast metal body of the shoe.

7. A bra-kc shoe comprising a cast metal body, a pan shaped ductilemetal shell and a supplemental reinforcing back plate of ductile metalsecured thereto within said ductile metal shell, said supplementalreinforcing plate being providedwith lips bentaway from the back wall ofsaid shell to extend within the body of the shoe and permit the metal ofthe shoe body to unite with said back wall in the casting operation.

8. A brake shoe comprising a cast metal body having, a pan shaped backof thin ductile metal, a supplemental reinforcing mem her of thickerductile metal located within said pan shaped back and a lug forattachment to the brake head, said lug having bent ends interlockingsaid back and supplemental member and embedded in the cast metal body ofthe shoe.

CLIFTON D. IETTIS.

Witnesses Geo. P. Fisnnn, I(A'IUAR|NE Gunmen.

